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<title>Drag Creating Tool</title>
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  <div id="sample">
    <div id="myDiagramDiv" style="background-color: white; border: solid 1px black; width: 100%;height: 800px"></div>
    <label><input id="ToolEnabled" type="checkbox" checked="checked"/>DragCreatingTool enabled</label>
    <p>
      This sample demonstrates the DragCreatingTool, which replaces the standard DragSelectingTool. It is defined in its own file,
      as <a href="DragCreatingTool.ts">DragCreatingTool.ts</a>.
    </p>
    <p>
      Press in the background and then drag to show the area to be occupied by the new node. The mouse-up event will add a copy
      of the DragCreatingTool.archetypeNodeData object, causing a new node to be created. The tool will assign its <a>GraphObject.position</a>      and <a>GraphObject.desiredSize</a>.
    </p>
  </div>

  <script type="module" id="code">
    import * as go from "../release/go-module.js";
    import { DragCreatingTool } from './DragCreatingTool.js';

    if (window.goSamples) window.goSamples(); // init for these samples -- you don't need to call this
    const $ = go.GraphObject.make; // for conciseness in defining templates

    const myDiagram =
        $(go.Diagram, 'myDiagramDiv', {
            // Define the template for Nodes, just some text inside a colored rectangle
            nodeTemplate: $(go.Node, 'Auto', { minSize: new go.Size(60, 20), resizable: true }, new go.Binding('desiredSize', 'size', go.Size.parse).makeTwoWay(go.Size.stringify), new go.Binding('position', 'pos', go.Point.parse).makeTwoWay(go.Point.stringify),
            // temporarily put selected nodes in ForegFround layer
            new go.Binding('layerName', 'isSelected', (s) => s ? 'Foreground' : '').ofObject(), $(go.Shape, 'Rectangle', new go.Binding('fill', 'color')), $(go.TextBlock, { margin: 2 }, new go.Binding('text', 'color'))),
            'undoManager.isEnabled': true
        });

    myDiagram.add($(go.Part, { layerName: 'Grid', location: new go.Point(0, 0) }, $(go.TextBlock, 'Mouse-down and then drag in the background\nto add a Node there with the drawn size.', { stroke: 'brown' })));

    class CustomDragCreatingTool extends DragCreatingTool {
        insertPart(bounds) {
            if (this.archetypeNodeData === null)
                return null;
            // use a different color each time
            this.archetypeNodeData.color = go.Brush.randomColor();
            // call the base method to do normal behavior and return its result
            return DragCreatingTool.prototype.insertPart.call(this, bounds);
        }
    }

    // Add an instance of the custom tool defined in DragCreatingTool.js.
    // This needs to be inserted before the standard DragSelectingTool,
    // which is normally the third Tool in the ToolManager.mouseMoveTools list.
    // Note that if you do not set the DragCreatingTool.delay, the default value will
    // require a wait after the mouse down event.  Not waiting will allow the DragSelectingTool
    // and the PanningTool to be able to run instead of the DragCreatingTool, depending on the delay.
    myDiagram.toolManager.mouseMoveTools.insertAt(2, $(CustomDragCreatingTool, {
        isEnabled: true,
        delay: 0,
        box: $(go.Part, { layerName: 'Tool' }, $(go.Shape, { name: 'SHAPE', fill: null, stroke: 'cyan', strokeWidth: 2 })),
        archetypeNodeData: { color: 'white' } // initial properties shared by all nodes
    }));

    window.myDiagram = myDiagram; // Attach to the window for console debugging

    function toolEnabled() {
      const enable = document.getElementById('ToolEnabled').checked;
      const tool = myDiagram.toolManager.findTool('DragCreating');
      if (tool !== null)
          tool.isEnabled = enable;
    }
  </script>
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